Integrated process for the preparation of 2-dialkoxyphosphinylimino-1,3-dithietane

Abstract From the Canadian patent

A fully integrated process for preparing a 2-dialkoxyphosphinylimino-1,3-dithietane in good overall yields with considerable savings in materials time and labor in-, volving a plurality of steps comprising the overall reaction of a dialkoxyphosphoryl chloride and an alkali metal - or ammonium thiocyanate to obtain a dialkoxyphosphinyl isothiocyanate, reacting the latter with 1.1 to 1.2 molar equivalents of an alkali mercaptan in the presence of a water and, finally, reacting resultant dialkoxyphosphinyldithiocarbamate with methylene bromide or methylene iodide in the presence or absence of a non-ionic surfactant under controlled pH conditions ranging from 5 to 8 to obtain resultant …